Red yucca plant named &#39;Coral Glow&#39;

ABSTRACT

A new and distinct plant variety of  Hesperaloe parviflora , more commonly known as Texas red yucca, with long greento purple-red tipped stems having flowers exhibiting a unique coral-orange color on the outside of the petals and yellow in the interior of the petals.

Latin name of the genus and species of the plant claimed: The ornamental plant variety of this invention is botanically identified as Hesperaloe parviflora.

Variety denomination: The variety denomination is ‘Coral Glow’.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct plant variety of Hesperaloe parviflora, more commonly known as Texas red yucca. The new variety has long purple-red stems with yellow and pink flowers.

Particularly in Southwestern United States, prolonged drought conditions and extended periods of extreme heat temperatures have expanded the commercial market for attractive, drought-tolerant, and vigorous ornamental plants. ‘Coral Glow’ provides a vibrant addition to landscapes.

‘Coral Glow’ was selected from several seedlings as the result of a cross between two garden plants. The female parent is Hesperaloe parviflora ‘Yellow’ (which is commercially available, unpatented) and the male parent is a Hesperaloe parviflora pink-red flowered specimen of unknown genetics (which is commercially available, unpatented). ‘Coral Glow’ was first asexually reproduced via tissue culture. The tissue culture process involved taking meristem tissue from un-opened flower buds of the original plant and placing it onto agar using standard tissue culture protocols. ‘Coral Glow’ is moderately responsive to the tissue culture process, but is not as prolific as other cultivars, based on the lab's experience with the yellow flowered seed parent.

BRIEF SUMMARY OF THE INVENTION

Plant Breeder's Rights for this variety have not been applied for and ‘Coral Glow’ has not been offered for sale more than a year before the tiling date of this application. ‘Coral Glow’ has not been promoted under any other breeder's reference or cultivar name.

Plants of ‘Coral Glow’ have not been observed wider all possible environmental and cultural conditions. The phenotype may vary somewhat with variations in environmental conditions, for example, with fluctuation in temperature, soil chemistry, and photoperiod without, however, any variance in genotype.

BRIEF DESCRIPTION OF THE PHOTOGRAPH(S)

The accompanying colored photographs illustrate the overall, typical appearance of the new and distinct red yucca plant showing the colors as true as it is reasonably possible to obtain in colored reproductions of conventional photography. Due to color variation reproduced in the photographs, color characteristics of this new variety should be determined with reference to the observations described herein, rather than a reliance on the photographs alone. Photographs were taken outdoors. The difterent photographs are intended to represent the distinctive characteristics of ‘Coral Glow’.

FIG. 1 (taken Jun. 13, 2015) is a close up view of the flowers and petals.

FIG. 2 (taken in Aug. 12, 2014) demonstrates the habit of the inflorescence.

DETAILED BOTANICAL DESCRIPTION

The following is a detailed description of the new variety ‘Coral Glow’ taken from plants about 10 years-in-age grown in an outdoor trail garden in Santa Fe, New Mexico. The color determinations are in accordance with the 2015 edition of The Royal Horticultural Society Colour Chart published by The Royal Horticultural Society (London, England), except where general color tenns of ordinary dictionary significance.

VARIETY DESCRIPTION

-   Classification and utility:     -   -   Botanical.—Hesperaloe parviflora.         -   Common.—Texas Red Yucca or Hummingbird Yucca.         -   Commercial classification.—Ornamental shrub.         -   Commercial use.—Containers or landscape plant. -   Parentage:     -   -   Female.—Hesperaloe parviflora ‘Yellow’ (commercially             available, unpatented).         -   Male.—Hesperaloe parviflora pink-red flowered specimen of             unknown genetics (commercially available, unpatented). -   Plant:     -   -   Plant type.—Perennial evergreen succulent.         -   Blooming period.—From late spring until first frost (as             observed in Santa Fe, New Mexico, United States located at             35.6870° N, 105.9378° W).         -   Growth habit.—Upright, clump-forming basal rosettes with             numerous inflorescences held above the foliage.         -   Growth rate.—Moderate.         -   Height and spread (average).—1.1 in height and 1.0 m in             spread (excluding peduncle, and 1.7 m in height, including             peduncle).         -   Branching habit.—Stemless, leaves arranged in basal rosettes             which clump close together with numerous inflorescences held             above the foliage.         -   Hardiness zone.—USDA 5 to 9. -   Leaf:     -   -   Leaf shape.—Gladiate, involute, and stiff.         -   Leaf division.—Simple.         -   Leaf base.—Clasping into a rosette, with new leaves emerging             from the center of the leaf clump.         -   Leaf arrangement.—Basal rosette.         -   Leaf apex.—Narrowly acute.         -   Leaf aspect.—Upright and outwards to arching.         -   Leaf venation.—Parallel, inconspicuous, color; upper and             lower surfaces matches leaf coloration.         -   Leaf margins.—Entire and fibrillose with curled fibrils.             Color: RHS NN155C, evenly spaced along the length of the             leaf.         -   Leaf size (average).—95.0 cm in length, 1.5 cm in width             towards the base, and 3.0 mm in width towards the apex.         -   Leaf surface.—Inner and outer surfaces; glabrous, tough, and             striate.         -   Leaf number.—An average of 12 leaves per rosette.         -   Leaf color.—Upper and lower surfaces (young and mature             leaves): RHS 137B Apex: Fading from RHS 144B to 144D towards             the base with RHS 157B Base: Very narrow stripe at the             margin RHS 166B.         -   Leaf attachment.—Sessile to rosette base. -   Flowers:     -   -   Inflorescence type.—Terminal upright with panicle bearing             numerous single flowers. Flower fragrance: None Flower type:             Campanulate to tubular Flower number (average):             Approximately 650 flowers per inflorescence, with             approximately 150 blooming at once Inflorescence size             (average): Height: 1.6 m (including peduncle) and 11.5 cm in             diameter Flower size (average): 2.2 cm in depth and 6.5 mm             in diameter Longevity of flowers (average): 3 days,             self-cleaning (pedicels persistent) Flower aspect: Upwards             when opening and outwards to nodding slightly downwards when             fully open.         -   Peduncle.—Primary peduncle; 1 per rosette, strong and stiff,             rounded in shape, held upright from basal rosette Length             (average): 1.6 Width (average): 1.3 cm at the proximal end             and 3 mm in width at the distal end. Color: RHS143C Surface:             Smooth, glabrous, and glaucescent Internode length: Up to 14             cm Stipule: 1 per node Shape: Triangular Apex: Acute Base:             Truncate and clasping Surface: Smooth and glabrous Color:             RHS143C, fading to a blend between RHS197D and 199C             Persistent: Becoming papery.         -   Secondary peduncle.—Strong and flexible. Number (average): 5             per primary peduncle Shape: Rounded Angle (average): 20° to             primary peduncle Length (average): 17.0 mm Width: 4.0 mm             Color: RHS143C Surface: Smooth and glabrous.         -   Pedicels.—Primary pedicel: An average of 25 per secondary             peduncle Shape: Rounded Angle (average): 30° to secondary             peduncle Length (average): 1.5 cm Width (average): 4 mm in             width, Color: RHS143C Stipules: Present between secondary             pedicels Shape: Triangular Surface: Thin and papery surface             Length (average): 3.0 mm Width (average): 3.0 mm Apex: Acute             Base: Truncate Color: Blend between RHS 39B and 143D             Secondary pedicel: An average of 15 per primary pedicel (5             with flowers actively blooming) Shape: Rounded to oval Angle             (average): Flexible, angle of 10° to primary peduncle Length             (average): 1.0 cm Width (average): 1.0 mm. Color: RHS39B             fading to RHS199A to 199B Surface: Smooth, glabrous, and             shiny.         -   Buds.—Shape: Elliptic Length (average): 1.5 cm Width             (average): 7.0 mm Color: R.HS39A to 39C Surface: Glabrous,             smooth, and shiny surface.         -   Sepals.—Number: 6 (3 inner and 3 outer) Shape: Elliptic             Apex: Acute, Base: Truncate Margin: Entire Surfaces (inner             and outer): Surfaces glabrous, smooth, and satiny Length             (average): 1.5 cm Width (average): 5.0 mm Color: Outer             sepals: Outer surface RHS39A to 39B, very lightly suffused             with RHS11A and inner surface RHS11B to 11C, lightly             suffused with RHS39A Inner sepals: Outer surface: RHS39B to             39D with central stripe RHS39A and margins RHS11B, inner             surface RHS11B to 11D suffused with RHS39B. -   Reproductive organs:     -   -   Gynoecium.—Pistil Number: 1 Length (average): 5.0 mm Stigma:             Shape: Flattened disc shape Color: RHSNN155D Size: Minute             Style: Length (average): 5.0 mm Width (average): 1.0 mm             Color: RHSNN155D Ovary: Superior Shape: Oval Depth             (average): 4.0 mm Width (average): 3.0 mm Color: RHSN144B to             N144D with RHS150C at the apex.         -   Androcoecium.—Stamen number: 6 Anthers: Dorsifixed Shape:             Linear Length (average): 3.7 mm Width (average): 1 mm Color:             RHS8A Filament: Length (average): 1.0 cm Width (average):             1.0 mm Color: RHSNN155C, suffused with RHS63B Pollen: Not             present.         -   Fruit/seed.—Not observed, plant is essentially sterile and             only occasionally sets seed. Pods and seeds are typical for             the species. -   Propagation: Tissue culture for both propagation and maintenance.     Time required for root development (average): 28 to 30 days with     rooted cutting produced after an average of 6 to 8 weeks     Description: Fibrous Color: RHS 160B. -   Best mode growing conditions:     -   -   Water use/drought tolerance.—Drought tolerant when planted             in the ground.         -   Fertilization.—Use standard water soluble 15-15-15 or             similar formulation every week to two weeks during growing             season.         -   Propagation.—Using industry standard tissue culture             protocols for Hesperaloe parviflora.         -   Landscape cultivation.—Top dressing of garden/landscape             plants in fall with a blend of compost and good quality             natural/organic fertilizer. -   Disease and pest resistance: ‘Coral Glow’ does not seem to be prone     to any diseases in cultivation, either in the tissue culture process     or growing in the landscape. And the plant doesn't appear to have     any increased resistance to common disease or insect pathogens. The     flowers, like all Hesperaloe, are fed upon by common green aphids in     the garden.

COMPARISON TO SIMILAR VARIETIES

Hesperaloe X ‘Perfu’ (U.S. Plant Pat. No. 21,728) Pink Parade, a hybrid between Hesperaloe fimifera and Hesperaloe parvifIora, has bright green foliage nearly one inch wide, and forms an upright clump of foliage 3 to 4 feet tall and wide. The 8-foot-tall branched flower spikes bear flowers with petals that have a bright pink exterior and light pink interior. The flower spikes are held strongly erect, forming a linear pink line when planted in rows. In contrast, ‘Coral Glow’ is not an interspecific hybrid, with both parents of the species parvylora. The foliage is narrower and olive-green in color, not bright green. ‘Coral Glow’ is smaller at mature size. The flower spikes are not as tall and not held erect, instead arching outward from the rosette of sterns. The flowers are coral-orange in color, not pink.

Hesperaloe parviflora ‘Perpa’ Brakelights® (U.S. Plant Pat. No. 21,729) is a noticeably compact grower that forms an upright clump of narrow, blue-green leaves about 2 feet tall by 2 feet wide and blooms on short, 3 to 4-foot tall flower spikes bearing semi-double, vivid, red flowers with the petals having the same red color inside and out.

‘Coral Glow’, in contrast, is a larger plant at mature size both in the height and width of the rosette of foliage and the height of the flower spikes. The flowers are single in their petal arrangement and have a coral-orange exterior and yellow interior, not bright red.

‘Coral Glow’ differs from its seed parent, a yellow-flowered plant, primarily in its flower color being coral-orange color on the outside of the petals and yellow in the interior of the petals. ‘Coral Glow’ inherited the nearly sterile nature of its yellow flowered parent and is very similar in mature size. ‘Coral Glow’ is a smaller growing plant than the pink-red flowered pollen parent and its flower color, mentioned above is also visibly different from the pollen parent. 

I claim:
 1. A new and distinct variety of Hesperaloe parviflora plant, substantially as described and illustrated herein. 